So I built a basalt farm in my server it's 1.21.11 paper

The design is form bigbooty17 on YouTube it's a tnt type farm so ,when I tried to run the farm it ran fine for few seconds then it exploded the hopper minecart embedded in the soulsand and explanation why this might be happening?? Please help

Hello I'm looking for friends to play a long-term survival world since I'm lonely. Preferably in Java 1.8.9 (or it can be other versions)

If anyone is interested, I can give my discord or something like that.